Update test/sequential/test-http2-timeout-large-write-file.js

Co-authored-by: Antoine du Hamel <duhamelantoine1995@gmail.com>

Author: jasnell

test/sequential/test-http2-timeout-large-write-file.js

@@ -22,7 +22,7 @@ tmpdir.refresh();
 //    that the backing stream is still active and writing
 // 4) Our timer fires, we resume the socket and start at 1)
 
-const writeSize = 3000000;
+const writeSize = 32 << 10 << 10;
 const minReadSize = 500000;
 const serverTimeout = common.platformTimeout(500);
 let offsetTimeout = common.platformTimeout(100);